Tamping machine



June24, 1930. A. B. BABBITT TAMPING MACHINE 2 Sheets-Sheet 1 Filed June 5, 1928 June 24, 1930. A. B. BABBITT TAMPING MACHINE Filed June 5, 192's 2 Sheets-Sheet 2 a 0 Z 2 7 Q .3 .J j w I r u 2 T 725 \wmw n o z v -L 9 8 8 4 1 2 2 qowingupof thelope etion H I anebr'oflg 11 LiS PI ZbY being permittedqto strike against some-rigid? Petent ed June 19-30 v Q This invention rjelatesqtq improvements in;

"tamping; gmachines, petic u'1a1i1y machines. for tan'iping concnete i'ri ferms for the :p'l e;

"ductionpf concrete blo'cksfi- 130 descend in" res ity in order 430' "perform ,the tamping I ope'ra- I ti on. :iFor the-purposejof speedingfupx-the Q work as much as possible, the movements o f h am; are ,q' i' eregid, an s a c n equence; of; thi's'factend the, Weight ofthe tampeisfi 'c'qnsiderable inertia;is setflp ini'eaehktamper Ifjthe' tempers oints; an amovablenpartsy dlsiht'egretidnffefithe lfletal 'ef themaehine and .;1 j0 senin Of I attached parts, with a resulting s'jhort 5. eg-t pmper bees i g machine in 'df amper lQVQm'ent t ebleheretjo forek. V

' forvlriations, Weight It, t

heme

fiosi tion lfterfie :tafiipiilteperdkzien I I V ha b n l ompl te'd n While theiormisi being removed and fa'nothen i plag ecl in" jposir ployed' a series of vertical-lyarmnged,Wei; tieally; movable tempers f-lwhich 2118 neces s'arily relatively heavy. 5 These tampep's gape r ed by 0 m:mo ion fl dra ep mi ted? p'o nse tp' the-action; i ef gray Which" the; upward i mbtibli 0fand graduallyise as not {do iiinper fia shock to t-he' machine j ainfe; With consequent 'vibmio I 2 Another obj ect' ismhe stopping of the 1' upwardfmeftien of the rtampers 'without storing up energy that is; immediefiely cnsmned inv -the 1.c10W nWard ,nidfion of, the r other words; sesfop'p'ing' the upward m'otion as; itmoves upwardly which tend'sfte carry the t ampereupward fL1ntheI thfl;I15 is; desi r. able; It is n tpraeticel1 to infilease their, 2o leng s ch nt. hat gr vity alon 'wciuld termin te; the pwardem v menjt be; cause "of thefilecessariy increase im the; size .df; the: machi11e;and 1 because eiiery imireals'e -in the length of ;the tzt mper=jbar-inereasesj its? Weight and hence it? iner tie; to say nothing; of the *increased-.;,power 'rrequirecl iendthe;

'tampers', f in the use of hedWiaIhpl. S Tend :greeter 196 1 h ha ve been-possii:

ready, fadj ust'meiitin f :Qfjd

V Spee f moyer V ment-oikthetemperssithi jpre ent eliplicetionwl have ill uetgatedimthe p li n Q il ed gimy i ven n? Flg. 12

er zft e leempensefe inithe-"view b.

.ing taken, substantially on the line' 7 4-4 In the drawings, the frame of the machine is shown as comprising a pair of side members 10 of angle bar form, with a cross bar 11 at the'base and further cross bars 12 and 13 joining the side members above the base. Upon the cross bars-12 and'13 there issupported a supplemental frame which includes vertical members 14 and 15 and transverse'or horizontal Vmembers 16 and 17. In this supplemental frame is mounted the bulk of the movable parts of themachine. These parts will be describedwithout great attention to detail as a detailed description will be found in"my.'patent'No;

1,518,240, issued December 9, 1924, andas the present invention is applicable'lto all tamping machines of this; general character. 5

In the supplemental frame is mounted an uppercast'bar 18 and a--lower-cast bar '19 substantially identical'in form, each of these bars-being provided with sockets -20 having spherically curved lower portions-within which are mounted bearing members 21- formed with complemental spherical lower surfaces and having also-upper spherical surfaces engaged'by 'plates'22 that are se- Each of the tamper bars 24 has"-fixed thereupon a bracketv 26 to whichis pivoted' a spring-pressed impact plate 27.' The" openings thus insure freeandeasyinovement' of the bars "24' in their slide-bearings. Each or the tamper bars 241m afoot orjish'o'e25.-*

The numberof tampers may, ofcours'e, be varied to suit condltionsa brackets 26 have "arms- 28 provided 7 with desired; 1 1

v The tamper-s are raisedoneat a'time by a Seriesofi arms 31 having rollers 32 on their extremities, each" adaptedj-to. engage "the impact plate 27; on one ofthe. brackets 26, The spring 'm01 1jnti'ngof the impact by-the rollers 32. and lessensth'enois'e-iofthe -same. These arms 31 are'all 'mountediupon a shaft '33 -which has bearing in the supple-- mental frame and isprovided with a belt rqn a 7 satisfactory results,;'-known to thetra'cle as j a, fsnubber, is illustrated herein by wayjof 'ex ample, being marked 49. It is' supported plates serves to cushionfthfe blows 'delivered pulley 34 that. is, continuously; driven? some suitable sou-rc'e -of-poweri- I order to hold the gtampersiinfelevate" 3 P i Wherethe" i'mp act'plates; 27 are out fitting over rods 29 that are fixed in the angle bars -16: and '17 --ofthesupple-;

mental frame. By this latter means the bars 24 and the brackets -26fare fprevented from "turning; A cover plate 30 may bemounted upon the angle bars"1 6 .and 17"if:"

of reach of the rollers 32, there are provided a series of latches 35 pivoted at their upper extremities on the bar 16. The hooks at the lower ends of these latches are adapted to engage beneath projections 36 on the brackets 26. Normally, the latches 35' are all retracted by meansof a slide bar 37 having pins 38' for engagement with the latches,

the bar 37 being movable by means of a bell crank lever 39"and an operating rod 40. When the operation of the tampers is to, be interrupted, the rod 40 is-moved to the position illustrated in Fig. 1, whereupon the latches swing down and catch the projections 36 after they have moved upwardly beyondthehooks of the latches which are cam-shaped on their lower'sides for this machine,the tampers all fall simultaneously.

until-the feet,. 25 strike the} concrete in the mold or'until the; brackets '26 engage coil rp 's. When the rod 40 is pulled downwardly ntfit the operation of the springs 41. surrounding the tamperbars 24,

when theimpactgplat'es 27 are in position to-be engaged by thel'ar nsv 31 and again raised one at a time. v v a The means which I employ for retarding the upward movement "of the tamper bars willnow be described. The upper ends of the side members 1() of the frame are slotted for a short distance down fromthe tops thereof, as shown at 42in Fig. 2. A trans-' verse-bar 43 is arranged crosswise of the' frame at the upper end thereof, resting upon blocks '44 securedto the side'members '10. V

In cross-section," this "bar is preferably an" inverted T, andat its extremities the horizontal portions of the T- are removed" and the vertical web permitted: to extend" through the I slots '42 with: 1 a "loose. sliding fit. As guiding and steadying means maddition to the slots 42, I may secure a plate 44 to thej rear flange of each side member l O anda short piece-jof smaller size, angle bar 45 to the inner flange of" the member "10. Tofithe bottomi'or horizontal portion of the bar 43 I- may attach acushioning element ;'composedof two strips '46" of rubber belting 1 or the like; anda wear plate 47 ofrelatively thin sheet metalfi While I fdo I not regard'this cushioning; element as {es-"j sential, it is advantageous particularly a noise deadenen Interposed between; 'eaeh' end of the {bar 43' and the adjacent side member 1O of the jtional contact between two relatively movl 120. frame'thereisa frictional motion retarding;

able parts,arewell suited ftothe 'purp se.;; 7 One "such device that I have employed with smgm I 1 by means of a bracket T50 attached to the underside of bar 43. Referringrto Fig. 4 51' is a fixed tubular"element-in' which is slidably mounted; a short bar 52. i There; are shoes 53 and54 on the remo'teextrem-i ities of the parts5l and 52. ,A coil spring" 55 tends to expand these parts51 and 52.

- The inner ends of a metal band-"56 and of V a friction strap 57 are secured tothe' shoe 53. There are a number of convolutions of ,this band and strap, and the outerend of the strap is continued downwardlyfand at-i ,tached to the frame side member 10, as shown. v i 1 When a'pull is exerted upon one of the straps 57 it unwindssomewhat, butindo ing so the movement of its convolutions the slack'in'strap 57", and the-device is set over each other is frictionally retarded. At the conclusion of such. a movement, .the

spring 55 immediately rewindsor'takes' up f for the next motion-retarding operation;

As the roller .32 on each arm-31 strikes the impact plate 27 of the corresponding,- bracket 26, the tamping bar to which the bracket is attached is thrown upwardly quite violently and the upper end of the bar Y strikes a blow'upon the transverse bar 43,1

which i will be referred to I hereinafter, some times as a pad. jThisrblow tendsto .raise the pad and does do so to some extent. The raising of the pad is opposed by the two snubbers 49, theretarding faction of the snubbers being divided between the two snubbers in a 'proportionIwhich is'affected,

by the distance of each snubber from the particularbar 24 whichdeliversthe blow,

. For instance, thepartsmay-beso designed and arranged that the upward emotion of 40 either ofthe end bars 24: is opposed eXclu sively' or almost exclusively by the jadja 7 cent snubberythe pad then rocking. up-

wardly upon the block side of the frame as afulc'rum.

The movement of the bar 43 is quitesmall I in practice, being aboutfone-fourth of an inch in a machine'of av'erageslze and speed opportunity tofact upon the tampersfllong 1. Having fthus desoribe d myfinvention v claim: v 1 j i V 1'. 'In I a tamp1ng ,-machine,"a frame,

1 tampersr supported .therein ff-for 'rsvertical movement,; means for imparting upward enough to impart the latch hooks.

f'therein,

, said transverse bar means a being vadapted movement of; said-transverse bar;

7 In a tampingmachinaa frame, tampers suppor-tedthereini for vertical movement,- means for imparting'upward impulses to said tampersya pad againstfwhich said 7 any appreciable blowj-to impulses said ampersand 'means for frictio ally retarding the upward move-.-

mentz'of thetampers;

supported -therein for vertical movement, means' afor imparting upwardvimpulses to sa i'd talnpers, and: means becoming effective 7 nearthe limit of upward movement for snubbing iorqbrakingi said movement, said lastnamed means leaving the downward .Iiflove-1 2. 1161 a tamping machine, a frame, tampers 7 3'. Ina tamping-machine,aframe,tampers supportedrtherein for vertical movement, I

means for;.imparting upward impulses to said' tampers, and means: for Iimitingthe extent of the upward movement of the tampers comprising devices arranged to fric tionally retard upward I ovementand permit free downward movement s 4.; Inlaitamping machine,-a frame, tampers Y supported therein ,,f or vertical' movement,

, meansfor imparting upward impulses to said tampers, 'and means for limiting the; extent of thekupward movement of the tam ers com prising cooperating frictional sur aces partaking of relative [motion in contact with each other as. the tampers move upwardly.

5. In a tamping'machine, a frame, tampers support-ed therein for vertical movement, me'anslfor imparting upward imulses to I saidtampers, means forlimiting t e extent of the upward movement -ofg'the tampers comprising a device arranged to frictionally retardupward movement,- and actransverse .iecj

bar connected to saidxdevice and movably' contacted by said'tampersr supported in said frame in a positiont'o be" 6. In a tamping machine, a frame, tampers comprising vertical bars arranged in align.

ment in said frame and slidably supported verse. "bar}withlwhich said tampers are adapted to engage near the desired upward limit of their motion, said being mounted j forelightvertical movement,and frictional I v retardingmeans actingbetween eachendof r and said 1 frame, said upward to retard the tampers V are adapted to strike at :subsam tially the; upward limit ,of their motion,

means'uponsaid frame upon which said pad retard.thelupwardtiltingof thelpadh I a' pad against which said means for imparting upward vim v e e pulses tosa1dtanipers one at a time, a'trans- 44 at .the opposite;

f is adapted'to fulcrum, and means connecting s V I a remote portion of the pad withitheframe r comprising a device arranged to frictionally I f In'a'tamping machine,a frame, tampersi. supported therein for .vertical movement, meansffor impartingupward impulses to I sa df a p re I tampers are adapted to strike atrisubstani' said pad with said frame nea'r each fulcrum point, 'said means comprising a device arranged to frictionallyretard-the upward H movement-0f the pad. a V

In testimony whereof, hereunte affiXmy signature.

ARTHUR BI BABBITT. 

